package com.orderplus.opshop.common.util;

import java.security.MessageDigest;

/**
 * Created by zhouxj6112 on 2018/12/17.
 */
public class MD5Utils {

	private static final String hexDigIts[] = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};

	/**
	 * MD5加密
	 *
	 * @param origin      字符
	 * @param charsetname 编码
	 * @return
	 */
	public static String MD5Encode(String origin, String charsetname) {
		String resultString = null;
		try {
			resultString = new String(origin);
			MessageDigest md = MessageDigest.getInstance("MD5");
			if (null == charsetname || "".equals(charsetname)) {
				resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
			} else {
				resultString = byteArrayToHexString(md.digest(resultString.getBytes(charsetname)));
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return resultString;
	}


	public static String byteArrayToHexString(byte b[]) {
		StringBuffer resultSb = new StringBuffer();
		for (int i = 0; i < b.length; i++) {
			resultSb.append(byteToHexString(b[i]));
		}
		return resultSb.toString();
	}

	public static String byteToHexString(byte b) {
		int n = b;
		if (n < 0) {
			n += 256;
		}
		int d1 = n / 16;
		int d2 = n % 16;
		return hexDigIts[d1] + hexDigIts[d2];
	}

}
